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__________are structures that allow for one-way blood flow through the heart.
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__________are structures that allow for one-way blood flow through the heart.

User Dhrumil Bhankhar
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2 Answers

4 votes

Answer:

Momo

Step-by-step explanation:

User MuhammadNe
by
7.2k points
2 votes

Answer:

I'm only in 7th grade so I guess veins but idk

User JOberloh
by
7.8k points
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